fix: cargo install use cargo.lock

- --locked makes use of cargo.lock
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

lightningd/Dockerfile

@@ -91,7 +91,7 @@ RUN git clone $VLS_REPO vls
 RUN cd vls && \
     echo building $VLS_GIT_HASH \
     git checkout $VLS_GIT_HASH && \
-    cargo install --path ./vls-proxy --bin remote_hsmd_socket --profile release --root /usr/local/ && \
+    cargo install --locked --path ./vls-proxy --bin remote_hsmd_socket --profile release --root /usr/local/ && \
     cargo clean
 
 # final stage with runtime dependencies and pkgs